Motorcycle chain wheel with enhanced heat dissipation

Abstract

The motorcycle chain wheel comprises an inner wheel disc and an outer fluted disc, a plurality of teeth are arranged on the periphery of the outer fluted disc, and a plurality of mounting holes are formed in the inner wheel disc around the circumference of the axis of the inner wheel disc in an array mode. A plurality of first connecting ribs, a plurality of first heat dissipation holes, a plurality of second connecting ribs and a plurality of second heat dissipation holes are arranged between the inner wheel disc and the outer fluted disc, the first connecting ribs, the first heat dissipation holes, the second connecting ribs and the second heat dissipation holes are sequentially and alternately arranged in the circumferential direction of the inner wheel disc, the mounting holes correspond to the first connecting ribs, and the thickness of the inner wheel disc is larger than that of the outer fluted disc. The thickness of the first connecting ribs is gradually reduced from the inner gear disc to the outer fluted disc, and the thickness of the second connecting ribs is kept uniform and unchanged. The motorcycle chain wheel has the advantage that the heat dissipation capacity of the motorcycle chain wheel can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sprockets, in particular to a motorcycle sprocket with enhanced heat dissipation. Background Art

[0002] One of the most important transmission parts of a motorcycle is the sprocket at the rear wheel of the motorcycle.

[0003] The chain on the scooter is engaged, such as a wear-resistant motorcycle sprocket disclosed in Chinese patent document No. CN2022225671560. The sprocket disclosed in the application is provided with a connecting hole between the receiving groove and the through hole formed by the sprocket teeth, and the mud and sand in the receiving groove are discharged through the connecting hole, thereby improving the service life of the sprocket.

[0004] The disadvantage of the motorcycle sprocket in the prior art is the lack of a heat dissipation structure. During the process of the motorcycle sprocket cooperating with the chain transmission, a large amount of heat will be generated due to the friction and collision between the sprocket and the chain. The sprocket in the prior art usually uses the wind force of the motorcycle to dissipate heat. However, when there is an obstruction on the outer surface of the sprocket, such as carrying cargo or placing a cover to protect the sprocket, the heat dissipation capacity of the sprocket will be greatly reduced, affecting the service life of the motorcycle sprocket. Utility Model Content

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides a motorcycle sprocket with enhanced heat dissipation, which can improve the heat dissipation capacity of the motorcycle sprocket.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A motorcycle sprocket with enhanced heat dissipation comprises an inner wheel disc and an outer toothed disc, wherein a plurality of teeth are arranged on the outer circumference of the outer toothed disc, and a plurality of mounting holes are arranged in a circumferential array around the axis of the inner wheel disc, and a plurality of first connecting ribs, a plurality of first heat dissipation holes, a plurality of second connecting ribs and a plurality of second heat dissipation holes are arranged between the inner wheel disc and the outer toothed disc, wherein the first connecting ribs, the first heat dissipation holes, the second connecting ribs and the second heat dissipation holes are arranged alternately in the circumferential direction of the inner wheel disc, and the mounting holes are arranged corresponding to the first connecting ribs, the thickness of the inner wheel disc is greater than the thickness of the outer toothed disc, the thickness of the first connecting ribs gradually decreases from the inner wheel disc to the outer toothed disc, and the thickness of the second connecting ribs remains uniform and unchanged.

[0008] The thickness of the first connecting rib gradually decreases from the inner wheel disc to the outer toothed disc, and the thickness of the second connecting rib remains uniform. The above design forms a height difference between the first connecting rib and the second connecting rib. During the driving of the motorcycle, the sprocket rotates at high speed. When the air flows through the height difference area, a fan-like effect is formed, which can effectively guide the air flow and increase the air flow rate on the sprocket surface, thereby improving the heat dissipation efficiency of the motorcycle sprocket.

[0009] Preferably, the distance between the end of the first heat dissipation hole facing the axis of the inner wheel disc and the axis of the wheel disc is smaller than the distance between the end of the second heat dissipation hole facing the axis of the inner wheel disc and the axis of the inner wheel disc. The end of the first heat dissipation hole is closer to the axis of the inner wheel disc, and the airflow generated by the rotation of the motorcycle sprocket is located in different air ducts of the first heat dissipation hole and the second heat dissipation hole, which has a more reliable heat dissipation capacity.

[0010] Preferably, one end of the first heat dissipation hole facing the inner wheel axis is tangent to or intersects the circle where the mounting hole axis is located. The wind force generated by the first heat dissipation hole can reliably act on the area where the mounting hole is located, ensuring the heat dissipation capacity of the connection between the motorcycle sprocket and the shaft system.

[0011] Preferably, the first connecting rib and the second connecting rib are arranged in the same radial direction of the inner wheel disc. The first connecting rib and the second connecting rib can adapt to the rotation direction of the motorcycle sprocket to achieve smooth wind guidance; the longer connection length increases the elasticity of the first connecting rib and the second connecting rib, which is convenient for dealing with the pressure buffering when the outer toothed disc is impacted by the chain.

[0012] Preferably, the width of the first connecting rib is greater than that of the second connecting rib, and the thickness of the second connecting rib is equal to the thickness of the outer gear disc. The first connecting rib is large in width, and plays a reliable supporting role between the inner wheel disc and the outer gear disc. The second connecting rib is small in thickness and width, and plays an auxiliary supporting role. It can also reduce the weight of the second connecting rib, and play a role in reducing costs and saving materials.

[0013] Preferably, transition fillets are provided between the two sides of the first connecting rib and the adjacent second connecting rib, and the transition fillet on the side where the outer end of the first connecting rib is inclined is larger than the transition fillet on the other side of the first connecting rib. The angle between the side where the outer end of the first connecting rib is inclined and the inner wheel disc is smaller, so that the transition fillet on this side is larger than the transition fillet on the other side, which can effectively distribute the stress between the first connecting rib and the inner wheel disc, avoid stress concentration, and improve the structural strength.

[0014] Preferably, one side of the motorcycle sprocket is a plane, which serves as a mounting surface and is conducive to the positioning and mounting of the motorcycle sprocket.

[0015] The beneficial effect of the utility model is that the heat dissipation capacity and heat dissipation efficiency of the motorcycle sprocket can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 yes Figure 1 Schematic cross-sectional view at AA in the middle;

[0018] Figure 3It is a schematic diagram indicating the width dimensions of the first connecting rib and the second connecting rib in the present invention.

[0019] In the figure: inner wheel disc 1, outer gear disc 2, teeth 3, mounting holes 4, first connecting ribs 5, first heat dissipation holes 6, second connecting ribs 7, second heat dissipation holes 8. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Example

[0022] like Figures 1 to 3 As shown, a motorcycle sprocket with enhanced heat dissipation, one side of the motorcycle sprocket and the wheel axle is flat. The other side is convex. The motorcycle sprocket includes an inner wheel disc 1 and an outer toothed disc 2. The axis of the inner wheel disc 1 is provided with a coaxial circular hole to correspond to the corresponding wheel axle for installation. The outer circumference of the outer toothed disc 2 is provided with a plurality of teeth 3, and the high-frequency quenching hardness of the teeth 3 is HRC45~60, and the depth of the hardened layer is 1 to 2 mm. The inner wheel disc 1 is provided with four mounting holes 4 arranged in a circular array around its axis, and four first connecting ribs 5, four first heat dissipation holes 6, four second connecting ribs 7 and four second heat dissipation holes 8 are provided between the inner wheel disc 1 and the outer toothed disc 2. The first connecting ribs 5, the first heat dissipation holes 6, the second connecting ribs 7 and the second heat dissipation holes 8 are alternately arranged in sequence in the circumferential direction of the wheel disc, and the inner wheel disc 1, the outer toothed disc 2, the first connecting ribs 5 and the second connecting ribs 7 are an integrated structure. The first heat dissipation holes 6 and the second heat dissipation holes 8 are arranged through the axial direction of the inner wheel disc 1, and the mounting holes 4 are arranged corresponding to the first connecting ribs 5. The shapes of the first connecting rib 5 and the second connecting rib 7 are both approximately curved arcs, the shapes of the first heat dissipation hole 6 and the second heat dissipation hole 8 are both approximately rounded triangles, the thickness of the inner wheel disc 1 is greater than the thickness of the outer toothed disc 2, the thickness of the first connecting rib 5 gradually decreases from the inner wheel disc 1 to the outer toothed disc 2, and the thicknesses at both ends of the first connecting rib 5 correspond to the thickness of the inner wheel disc 1 and the thickness of the outer toothed disc 2, respectively, so that the first connecting rib 5 has a relatively smooth transition between the inner wheel disc 1 and the outer toothed disc 2. The thickness of the second connecting rib 7 remains uniform and unchanged. That is, the shape of the second connecting rib 7 is plate-shaped. The thickness of the second connecting rib 7 is equal to the thickness of the outer toothed disc 2, and the width of the first connecting rib 5 is greater than the width of the second connecting rib 7. The above thickness refers to the axial dimension of the inner wheel disc 1. In this embodiment, the first connecting rib 5 and the second connecting rib 7 are both curves, so the width here is not only the width dimension in the conventional sense, but also the width of the first connecting rib 5 and the second connecting rib 7 in the normal direction of the arc as in this embodiment, which are exemplarily marked as L1 and L2 in the figure respectively.

[0023] The first connecting rib 5 and the second connecting rib 7 are arranged in the same inclined direction in the radial direction of the inner wheel disc 1. Figure 1As shown, the outer ends of the first connecting rib 5 and the second connecting rib 7 are inclined in a clockwise direction from the axis of the inner wheel disc 1 to the outside.

[0024] like Figure 1 As shown in , the distance between the end of the first heat dissipation hole 6 facing the wheel axis and the wheel axis is smaller than the distance between the end of the first heat dissipation hole 6 facing the wheel axis and the wheel axis. The end of the first heat dissipation hole 6 facing the wheel axis intersects with the circle where the axis of the mounting hole 4 is located. The end of the second heat dissipation hole 8 facing the inner wheel axis is separated from the circle where the axis of the mounting hole 4 is located.

[0025] Transition fillets are provided on both sides of the first connecting rib 5 and between the adjacent second connecting rib 7, and the transition fillet on the side where the outer end of the first connecting rib 5 is inclined is larger than the transition fillet on the other side of the first connecting rib 5. In this embodiment, the transition fillet radius on the side where the outer end of the first connecting rib 5 is inclined is 3 mm, while the transition fillet radius on the other side of the first connecting rib 5 is 1.5 mm.

[0026] When the present application is used, the motorcycle sprocket rotates around the axis on the axis of the inner wheel disc 1, the thickness of the first connecting rib 5 in the motorcycle sprocket is greater than the thickness of the second connecting rib 7, and the airflow generated when the motorcycle sprocket rotates enters the first heat dissipation hole 6 and the second heat dissipation hole 8 from the outer toothed disc 2, and then diffuses at the first connecting rib 5 and the second connecting rib 7 to form a surface airflow, thereby achieving reliable heat dissipation of the motorcycle sprocket.

Claims

1. A motorcycle sprocket with enhanced heat dissipation, characterized in that: It includes an inner wheel disc and an outer toothed disc, the outer circumference of the outer toothed disc is provided with a plurality of teeth, the inner wheel disc is provided with a plurality of mounting holes arranged in a circular array around its axis, a plurality of first connecting ribs, a plurality of first heat dissipation holes, a plurality of second connecting ribs and a plurality of second heat dissipation holes are arranged between the inner wheel disc and the outer toothed disc, the first connecting ribs, the first heat dissipation holes, the second connecting ribs and the second heat dissipation holes are alternately arranged in sequence in the circumferential direction of the inner wheel disc, the mounting holes are arranged corresponding to the first connecting ribs, the thickness of the inner wheel disc is greater than that of the outer toothed disc, the thickness of the first connecting ribs gradually decreases from the inner wheel disc to the outer toothed disc, and the thickness of the second connecting ribs remains uniform.

2. A motorcycle sprocket with enhanced heat dissipation according to claim 1, characterized in that: The distance between one end of the first heat dissipation hole facing the inner wheel disc axis and the inner wheel disc axis is smaller than the distance between one end of the second heat dissipation hole facing the inner wheel disc axis and the inner wheel disc axis.

3. A motorcycle sprocket with enhanced heat dissipation according to claim 2, characterized in that: One end of the first heat dissipation hole facing the axis of the inner wheel disc is tangent to or intersects with the circle where the axis of the mounting hole is located.

4. A motorcycle sprocket with enhanced heat dissipation according to claim 1, characterized in that: The first connecting rib and the second connecting rib are arranged to be inclined in the same direction in the radial direction of the inner wheel disc.

5. The motorcycle sprocket with enhanced heat dissipation according to claim 1, characterized in that: The width of the first connecting rib is greater than the width of the second connecting rib, and the thickness of the second connecting rib is equal to the thickness of the outer gear disc.

6. A motorcycle sprocket with enhanced heat dissipation according to claim 1, characterized in that: Transition fillets are provided on both sides of the first connecting rib and the adjacent second connecting ribs, and the transition fillet on the inclined side of the outer end of the first connecting rib is larger than the transition fillet on the other side of the first connecting rib.

7. A motorcycle sprocket with enhanced heat dissipation according to any one of claims 1 to 6, characterized in that: One side of the motorcycle sprocket is a plane.

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